Chickenpox is caused by varicella-herpesvirus infection, due to individual differences in viral pathogenicity and immunity, the time for fever to subside is not fixed, and most patients can have their fever completely subside in about 1 week when there are no complications. If chickenpox occurs in children, the fever usually lasts for 3-5 days, and the temperature will gradually decrease after the chickenpox comes out gradually. Some patients with chickenpox only have a fever on the first day, and the temperature returns to normal later, but it does not affect the further development of chickenpox. In some severe cases, the fever is longer, around 1 week. Fever caused by chickenpox does not need special treatment, need to pay attention to care, avoid wind, avoid cold, avoid eating too high calorie food. Chickenpox temperature in 39 ℃, a small number of 39 ℃ -40 ℃, children’s temperature is higher, so need to be alert to the phenomenon of children’s febrile convulsions. It is recommended to actively carry out antiviral and symptomatic supportive treatment, fever can be used pediatric ibuprofen suspension or hormone drug treatment; with warm water to wipe the body, physical cooling. Chickenpox fever degree is more serious, can follow the doctor’s advice to take antiviral oral solution and acetaminophen, ibuprofen or application of physical cooling method of treatment. During the chickenpox period, avoid scratching the chickenpox, pay attention to keep warm, avoid getting cold, and drink more boiled water. Avoid spicy food and eat more vegetables and fruits.